[dpdk-dev] [PATCH 2/3] net/virtio: fix crash when close virtio dev twice

[hanxueluo@126.com]

From: Huanle Han <hanxueluo@gmail.com>

This commit fixs segment fault when rte_eth_dev_close()
is called on a virtio dev more than once.
Assigning zero after free to avoids freed memory to
be accessed again.

Signed-off-by: Huanle Han <hanxueluo@gmail.com>
---
 drivers/net/virtio/virtio_ethdev.c | 5 +++++
 lib/librte_ether/rte_ethdev.c      | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 8465e1a..b9565db 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -545,6 +545,9 @@ virtio_free_queues(struct virtio_hw *hw)
 	int queue_type;
 	uint16_t i;
 
+	if (hw->vqs == NULL)
+		return;
+
 	for (i = 0; i < nr_vq; i++) {
 		vq = hw->vqs[i];
 		if (!vq)
@@ -563,9 +566,11 @@ virtio_free_queues(struct virtio_hw *hw)
 		}
 
 		rte_free(vq);
+		hw->vqs[i] = NULL;
 	}
 
 	rte_free(hw->vqs);
+	hw->vqs = NULL;
 }
 
 static int
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index eb0a94a..24f82dc 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1074,8 +1074,10 @@ rte_eth_dev_close(uint8_t port_id)
 	dev->data->dev_started = 0;
 	(*dev->dev_ops->dev_close)(dev);
 
+	dev->data->nb_rx_queues = 0;
 	rte_free(dev->data->rx_queues);
 	dev->data->rx_queues = NULL;
+	dev->data->nb_tx_queues = 0;
 	rte_free(dev->data->tx_queues);
 	dev->data->tx_queues = NULL;
 }
-- 
2.7.4